This is one of those arena levels where you fight successive waves of monsters. Contrary to the title there are several places where you can hide indefinitely - right at the start, for example - although the level is dull if you do. The level is fun if you take the time to release all the monsters at once. Ultimately though you can just run to the exit - the bit with the spider boss seems superfluous. I finished it in 0:57 and I wasn't trying hard.